Moisture impervious packaging systems

ABSTRACT

Moisture impervious packaging systems for retaining articles include a container body and a closure lid hingedly connected thereto. The container body includes a bottom wall and upwardly extending peripheral walls ending in an upper surface that defines an access opening into an interior compartment in which the articles are retained. The lid includes a peripheral frame member providing the side margins of the lid, and a separate moisture impervious sheet adhered to the frame member for providing the top wall of the lid. The moisture impervious sheet constituting the top wall of the lid preferably is also adhered to the upper surface of the container body for providing a primary moisture impervious seal for the interior compartment of the container body. 
     The moisture impervious packaging systems are formed by maintaining the peripheral frame member about the outer periphery of the container body with an upper surface of the frame member spaced outwardly from, and adjacent to the upper surface of the container body to circumscribe the access opening into the interior compartment, and, after articles have been deposited into the interior compartment, adhering the moisture impervious sheet to the upper surface of the peripheral frame member to complete the formation of the lid, and preferably to the upper surface of the container body to provide the primary moisture impervious seal for the interior compartment.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to moisture impervious packaging systems, and tomethods of making them.

2. Description of the Prior Art

Moisture impervious packaging systems for retaining articles therein arewell known in the prior art. A representative packaging system of thistype is disclosed in U.S. Pat. No. 3,904,074, issued to Louis S. Hoffmanet al. and assigned to Scott Paper Company. That packaging systemincludes, in its preferred embodiment, a container body having aninterior compartment for retaining articles therein, and a moistureimpervious sheet or film adhered to the container body over the open endthereof to provide a primary seal which prevents moisture from eitherentering into or escaping from the interior compartment. This primaryseal is often necessary to provide a relatively long-shelf, (i.e., 6months to 2 years) for articles packaged within the container. Inaddition, the packaging system disclosed in the U.S. Pat. No. 3,904,074includes a hinged lid which is capable of providing a suitable secondaryseal after the primary seal has been broken to prevent damage to thearticles prior to the time they are used up.

In packaging systems of the above-described type the hinged lidproviding the secondary seal and the moisture impervious sheet providingthe primary seal are fabricated as completely separate elements. Theyare then assembled with the container body to complete the formation ofthe packaging system.

Although a packaging system as described in the U.S. Pat. No. 3,904,074has been employed successfully in the sale of premoistened baby wipes,improvements residing in reducing material and manufacturing costs, aswell as in simplifying assembly operations are always desirable. It isto these improvements that the instant invention is directed.

SUMMARY OF THE INVENTION

The moisture impervious packaging systems of this invention include acontainer body and a closure lid hingedly connected thereto. Thecontainer body includes a bottom wall and upwardly extending peripheralwalls ending in an upper surface that defines an access opening into aninterior compartment in which articles are retained. In a preferredembodiment the upper surface of the container body is the top surface ofan outwardly extending peripheral flange section of the peripheralwalls. The closure lid includes a peripheral frame member and aflexible, moisture impervious sheet. The peripheral frame membercircumscribes the outer periphery of the container body to form theperipheral wall of the lid. The frame member includes an upper surfacespaced outwardly from the upper surface of the container body. Themoisture impervious sheet is adhered to the frame member to provide atop wall of the lid, and, in the most preferred embodiments of theinvention, the impervious sheet is also adhered to the frame member toprovide a moisture impervious seal over the access opening into theinterior compartment of said container body.

When the moisture impervious sheet which forms the top wall of the lidalso is adhered to the upper surface of the container body to provide amoisture impervious seal for the interior compartment, the need for aseparate sheet to form such a seal is eliminated. Accordingly, lessmaterial is required to form the packaging systems of this invention,than is required to form packaging systems of the type disclosed in U.S.Pat. No. 3,904,074. A further advantage of the preferred embodiments ofthe instant invention is that the primary seal is formed simultaneouslywith completing the formation of the lid in its closed position. Thiseliminates the need for a separate assembly step of placing the lid in aclosed position on the container body after the primary seal has beenapplied to said container body.

In accordance with the method of this invention the moisture imperviouspackaging systems are formed by maintaining the peripheral frame memberabout the outer periphery of the container body with an upper surface ofthe frame member spaced outwardly from and adjacent to the upper surfaceof said container body to circumscribe the access opening into theinterior compartment. After articles have been deposited into theinterior compartment a moisture impervious sheet is adhered to theperipheral frame member to complete the formation of the closure lid,and preferably to the upper surface of the container body to form amoisture impervious seal for the interior compartment. Accordingly, thefabrication of the closure lid is completed with the lid in its closedposition, and at the same time a primary moisture impervious seal forthe interior compartment of the container body is formed. This providesfor a simple and reliable assembly operation which is not achieved inthe fabrication of packaging systems of the type disclosed in U.S. Pat.No. 3,904,074.

In one embodiment of this invention the peripheral frame member ismolded separately from the container body. In this embodimenttransversely aligned flexing regions are provided in side walls of thepheripheral frame member intermediate front and rear ends thereof toprovide the hinge for the lid. Preferably the flexing regions areprovided by weakening the frame member, such as by thinning or notchingthe sidewalls of the peripheral frame member. The weakened regions ofthe frame member divide the lid into a forward movable door portion anda rearward stationary cover portion when the lid is connected to thecontainer body. The region of the frame member forming the peripheralwall of the cover portion of the lid includes a retaining rib whichextends inwardly into underlying relationship with a downwardly facingsurface of the rear and side peripheral walls of the container body.Preferably, this downwardly facing surface is provided by an outwardlyextending peripheral flange section of the peripheral walls of thecontainer body. The moisture impervious sheet of the closure lid isadhered to both the upper surface of the container body and the uppersurface of the peripheral frame member to cooperate with the inwardlyextending retaining rib for maintaining the cover portion of the closurelid in a stationary condition on the container body when the doorportion of the lid is opened.

Preferably, a latching tab extends inwardly from a front end of theperipheral frame member into underlying relationship with a downwardlyfacing surface of a front peripheral wall of the container body topositively maintain the door portion in a closed position when desired.This latching tab is manually defeatable by a user to permit the doorportion to be pivoted about the hinge of the frame member for providingaccess into the interior compartment of the container body to removearticles therefrom.

The packaging system including the above-described peripheral framemember is formed by positioning the container body within a centralopening provided by the peripheral frame member with the downwardlyfacing surfaces of the container body disposed in overlying relationshipwith the retaining rib of said frame member. When a latching tab isprovided on the frame member a downwardly facing surface of thecontainer body will also be disposed in overlying relationship with saidlatching tab. Preferably, the container body and peripheral frame memberare supported in a suitable jig so as to maintain the above-describedrelationship, and the moisture impervious sheet is adhered to the uppersurfaces of the container body and peripheral frame member by a suitableadhesive.

In an alternative embodiment of this invention the hinge comprises a webof resilient material connecting the rear end of the peripheral framemember to a rear peripheral wall of the container body. In thisembodiment the frame member, hinge and container body may be integrallyinjection molded as a single unit with the peripheral frame membercircumscribing the outer periphery of the container body in the positionit assumes when the lid is closed. By forming the peripheral framemember in a closed lid position the amount of mold space required toinjection mold the packaging system is substantially reduced, ascompared to the mold spaced required to mold the lid in an openedposition relative to the container body, or as a completely separatemember.

This same embodiment may also be vacuum molded by forming the containerbody with a peripheral flange having a width substantially equal to thecombined widths of the frame member and container body flange section.The flange is then die cut intermediate its marginal ends to separatethe frame member. A section of the flange is left uncut to provide theweb of resilient material which forms the hinge connection between theframe member and the container body.

After the container body, hinge and peripheral frame have been formed asa single unit a moisture impervious sheet is adhered to the peripheralframe member to complete the formation of the lid in its closedposition. Most preferably the moisture impervious sheet is also adheredto the upper surface of the container body to provide a primary moistureimpervious seal for the packaging system. The peripheral frame memberand container body can be retained directly in the mold or die in whichit is formed when the moisture impervious sheet is adhered to thecontainer body and frame member, or alternatively, the container bodyand integrally joined peripheral frame member can be retained in aseparate supporting jig.

Preferably, a front end of the peripheral frame member is provided withan inwardly directed latching tab extending into underlying relationshipwith a downwardly facing surface of a front peripheral wall of thecontainer body to positively maintain the lid in a closed position afterthe primary moisture impervious seal has been broken by the opening ofthe lid. However, when the peripheral frame member of the lid and thecontainer body are molded simultaneously with the peripheral framemember in a closed lid position circumscribing the outer periphery ofthe container body it is extremely difficult, if not impossible, todirectly mold the latching tab in underlying relationship with adownwardly facing surface on the container body. Accordingly, in apreferred method of this invention in which a latching tab is providedon the peripheral frame member, the latching tab end of the frame memberis initially molded or die-cut so that the inwardly extending latchingtab terminates exteriorly of the downwardly facing surface of the frontperipheral wall of the container body. After the forming operation thelatching tab end of the frame member is depressed inwardly, such as byplacing the combined container and frame assembly in a suitable jig, toforce the latching tab into underlying relationship with the downwardlyfacing surface on the front peripheral wall of the container body. Theframe member is maintained in this depressed condition as the moistureimpervious sheet is adhered in a taut condition to the upper surfaces ofthe container body and the frame member. The moisture impervious sheetwill maintain the frame member in its depressed condition after thedepressing force has been removed, i.e., after the packaging system hasbeen removed from its supporting jig. This method of forming a packagingsystem provides the two-fold advantage of permitting the container bodyand frame member to be simultaneously formed with the peripheral framemember in its closed lid position to minimize mold space, and at thesame time, permits the inclusion of a latching tab on the frame memberfor positively maintaining the lid in a closed position after theprimary seal has been broken.

Other objects and advantages of this invention will become apparent byreferring to the detailed description which follows, taken inconjunction with the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is partially exploded isometric view of a moisture imperviouspackaging system of this invention;

FIG. 2 is sectional view taken along line 2--2 of FIG. 1, with theelements of the packaging system assembled;

FIG. 3 is bottom view of the closure lid frame member of the packagingsystem of FIG. 1;

FIG. 4 is an isometric view of the packaging system of FIG. 1 with theclosure lid in its opened position;

FIG. 5 is an exploded isometric view of an alternative embodiment of apackaging system of this invention;

FIG. 6 is a sectional view along line 6--6 of FIG. 5 with the elementsof the packaging system assembled;

FIG. 7 is an exploded isometric view of another embodiment of apackaging system of this invention with the phantom line representationshowing an intermediate stage of formation; and

FIG. 8 is a sectional view along line 8--8 of FIG. 7, showing thepackaging system in its completed form.

DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION

This invention relates to packaging systems which are substantiallymoisture impervious. These packaging systems find their most significantapplication for retaining articles therein which would be damaged byeither the entrance of moisture into the packaging system or the escapeof moisture from the packaging system. One specific application of thepresent invention is in the packaging of premoistened fibrous webs whichcan be employed as wipers for many applications. For example, suchpremoistened wipers are becoming popular for cleansing many parts of thehuman body, such as the perineal region, arms, hands, etc. Although thepackaging systems of this invention will be described in connection withpremoistened wipers, it should be understood that this use is merelyillustrative, and is not intended to be a limitation on the broaderaspects of the instant invention.

Referring to FIGS. 1 and 2, a packaging system 10 in accordance withthis invention includes a container body 12 having a bottom 14 andupwardly extending peripheral walls 16 that end in an upper surface 18.The upper surface 18 defines an access opening into an interiorcompartment 20 in which premoistened fibrous webs 21 are contained in astacked condition. The container body 12 includes a downwardly facingsurface 22 which, along with the upper surface 18, is provided by anoutwardly directed peripheral flange section 23 of the peripheral walls16.

Referring to FIGS. 1-3, a closure lid 24 forms a part of the packagingsystem 10, and includes a peripheral frame member 26 and a flexible,moisture impervious sheet 28. The peripheral frame member 26 forms thesides of the lid and the moisture impervious sheet 28 forms the top ofthe lid. The frame member 26 includes an upper surface 30 adjacent to,and spaced outwardly from the upper surface 18 of the container body 12when the lid is in a closed position. Accordingly, the peripheral framemember 26 circumscribes the container body 12.

The moisture impervious sheet 28 forms the top of the lid 24 by beingadhered to the upper surface 30 of the frame member 26. In addition, themoisture impervious sheet 28 is adhered to the upper surface 18 of thecontainer body 12 to provide a primary moisture impervious seal for theinterior compartment 20 to provide a relatively long shelf life for thepremoistened wipes, e.g., from about 6 months to about 2 years. Anyadhesive which is compatible with the materials of the moistureimpervious sheet 28, the container body 12 and the peripheral framemember 26 can be employed to adhere the moisture impervious sheet to thecontainer body and frame member. Alternatively, if the moistureimpervious sheet 28 includes a material which can be compatibly bondeddirectly to the container body 12 and the peripheral frame 26 the use ofheat and pressure may be sufficient to affect the bonds.

The closure lid 24 is hinged connected to the container body through ahinge 32 provided in the peripheral frame member 26 to permit access tothe interior compartment 20 of the container body without completelyremoving the lid 24 from said body. The specific structure providingthis function will be described in detail later in this application.

Preferably the peripheral frame member 26 is a unitary, injection moldedmember including a top wall 33 and a downwardly extending peripheralskirt 34. The top wall 33 includes the upper surface 30 of the framemember. The hinge 32 is provided by transversely aligned thinned regionsprovided by notches 38 in opposed side walls 40 of the peripheral skirt34 intermediate front and rear end walls 42 and 44, respectively, of theframe member 26. If necessary to provide an acceptable hinge action forthe closure lid 24, the lower surface 46 of the top wall 33 of the framemember can also be provided with thinned regions 47 that aretransversely aligned with the notches 38 (FIG. 3).

Referring to FIGS. 2 and 3, the peripheral frame member 26 includes aretaining rib 48 provided by an inwardly directed extension of top wall33 at the rear and sides of the peripheral frame member. This ribterminates adjacent the hinge 32. The retaining rib 48 can becontinuous, or discontinuous as desired. Preferably, a latching tab 50is provided by an inwardly directed extension of top wall 33 at thefront end of the peripheral frame member.

In a method of fabricating the packaging system 10 in accordance withthis invention the container body 12 and the peripheral frame member 26are molded as separate elements. The container body is inserted throughthe central opening of the frame member 26, and the container and framemember are supported in a suitable jig such that the downwardly facingsurface 22 of the peripheral flange section 23 of the container body 12seats on the retaining rib 48 and latching tab 50 of the frame member26. Preferably the frame member 26 is dimensioned such that the uppersurface 18 of the container body 12 and the upper surface 30 of theframe member 26 are maintained in substantially the same plane tofacilitate the subsequent adherence of the moisture impervious sheet 28to both upper surfaces (FIG. 1). After the moisture impervious sheet 28has been adhered to the upper surfaces 18 and 30 of the container body12 and frame member 26, respectively, the peripheral flange section 23of the container body is positively captured between the moistureimpervious sheet on the top, and the retaining rib 48 and locking tab 50on the bottom. Accordingly, by the simple operation of adhering themoisture impervious sheet 28 to the container body 12 and the peripheralframe member 26, the formation of the closure lid 24 is completed withthe lid latched in its closed position, and a primary moistureimpervious seal is provided for the interior compartment 20. Therefore,a separate assembly step of closing the lid is not necessary in thepackaging system 10 of this invention. Moreover, since a single moistureimpervious sheet provides both the top wall of the closure lid 24 and aprimary moisture impervious seal for the interior compartment 20 thematerial costs are reduced, as compared to similar packaging systems inwhich the lid is formed separate and apart from the moisture impervioussheet employed as a primary seal for the interior compartment of thecontainer body. Obvious, the contents to be contained within thepackaging system 10 are placed within the interior compartment 20 priorto adhering the moisture impervious sheet 28 to the upper surfaces ofthe container body 12 and the peripheral frame member 26.

Referring to FIG. 4, the hinge 32 divides the lid 24 into a forwardmovable door portion 52 and a rearward stationary cover portion 54. Thecooperative locking arrangement between latching tab 50 and peripheralflange section 23 can be manually defeated by a user to permit the doorportion 52 to be pivoted about the hinge 32 to the position shown inFIG. 4. This pivotal movement peels the moisture impervious sheet 28from the upper surface 18 of the container body 12 to break the primaryseal. This peel force is not imposed between the moisture impervioussheet 28 and the upper surface of the peripheral frame member 26.Accordingly, the moisture impervious sheet 28 remains adhered to theframe member 26 as the door portion 52 is pivoted to its open positionshown in FIG. 4.

The stationary cover portion remains connected to the container body bythe cooperation of the retaining rib 48 and the moisture impervioussheet 28 with the flange section 23 of the container body. The hinge 32prevents the sheet 28 from being peeled off of the upper surface 18 ofthe container body rearwardly of the hinge.

Referring to FIGS. 5 and 6, an alternative embodiment of a packagingsystem 10a in accordance with this invention is disclosed. Thispackaging system includes a container body 12a having generally the samestructure as that disclosed in connection with the packaging system 10.However, in this embodiment a hinge 32a between the container body 12aand a closure lid 24a is provided by a flexible web section 56connecting a rear wall of a peripheral frame member 26a with a rear wallof a peripheral flange section 23a of the container body. The peripheralframe member 26a does not include an inwardly directed retaining rib 26aor latching tab, as disclosed in connection with the packaging system10. The peripheral frame member 26a is shown as a substantially flatmember, i.e., it is devoid of a downwardly extending peripheral skirt.However, such a skirt should be provided if greater rigidity of theframe member is desired, or required.

The container body 12a and peripheral frame member 26a of the packagingsystem 10a may be formed simultaneously by an injection moldingoperation with the web section 56 connecting the rear ends of said framemember and container body. The peripheral frame 26a is molded in itsclosed lid position circumscribing the outer periphery of the containerbody 12a. This provides a fabricating advantage by reducing the moldcavity space required to form the packaging system, as compared to thatrequired to mold the container body with a lid in an opened position, orto mold the lid and container body as completely separate and distinctmembers.

The container body 12a, peripheral frame member 26a, and web section 56of the packaging system 10a may also be formed by a vacuum molding anddie-cutting process. In accordance with this latter process thecontainer body 12a is formed with a peripheral flange having a widthsubstantially equal to the combined widths of the frame member 26a andflange section 23a of the container body. A die is them employed todie-cut the flange intermediate its marginal ends to separate the framemember 26a from the flange section 23a. A section of the flange is leftuncut to provide the web section 56 which forms the hinge connectionbetween the rear ends of the frame member and the container body.

After the container body 12a and peripheral frame member 26a have beenformed, a moisture impervious sheet 28a is adhered to the frame memberand container body in the same manner as described above in connectionwith fabrication of the packaging system 10.

Since the packaging system 10a does not include a latching tab forpositively retaining the lid 24a in a closed position after it has oncebeen initially opened to break the primary seal, the weight of theclosure lid must be relied upon to provide an effective secondary sealfor the container compartment. However, such an arrangement may not besuitable for many applications. Accordingly, it is highly desirable tobe able to form a moisture impervious packaging system with its lid in aclosed position, as shown in FIGS. 5 and 6, and at the same time includea latching tab extending inwardly from the peripheral frame member forunderlying a downwardly facing surface of the container body topositively retain the lid in a closed position.

Referring to FIGS. 7 and 8, a packaging system 10b is substantiallyidentical to the packaging system disclosed in FIGS. 5 and 6, butincludes a latching tab 50b (FIG. 8) which is adapted to underlie aperipheral flange section 23b of container body 12b for positivelymaintaining a lid 24b in a closed position after said lid has beenopened to break the connection between moisture impervious sheet 28b ofthe lid and upper surface 18b of the container body.

In conventional injection molding operations a latching tab cannot bedirectly molded separately from, and in close underlying relationshipwith a peripheral flange of a container body when molding a peripheralframe member containing said tab in its closed lid position. Thisresults from the fact that the latching tab must underlie and be engagedwith the undersurface of the peripheral flange when the frame member isin a closed position. If it is attemped to directly mold the latchingtab in underlying engagement with the lower surface of the peripheralflange the latching tab merely becomes a continuous connected extensionof lower surface of the peripheral flange, and would subsequently haveto be separated from the flange in an additional manufacturingoperation.

In accordance with a unique method of this invention for forming thepackaging system 10b a peripheral frame member 26b is molded incircumscribing relationship with the container body 12b in theconfiguration shown in phantom lines in FIG. 7. The phantom position oflatching tab 50b is omitted from FIG. 7 for simplicity of illustration.Referring to FIG. 8, the latching tab 50b is an integral, inwardlydirected extension of the frame member 26b, and terminates in outwardlyspaced relationship to an outer margin 60 of the peripheral flange 23bas shown in phantom. If desired the injection molding operation can becarried out in a manner which connects the outermost edge of thelatching tab 50b to the outer margin 60 of the peripheral flange 23bthrough a thin plastic section which is referred to as "flash."Preferably, the latching tab 50b is disposed below the plane of theperipheral flange to permit the latching tab 50b to be forced intounderlying relationship with the peripheral flange by applying adeforming force to the front wall of the frame member in the directionof arrow 62. When flash connects the latching tab to the peripheralflange it will be broken by the deforming force. The position of theframe member 26b, with the deforming force applied thereto, is shown insolid lines in FIGS. 7 and 8. While maintaining this deformed force onthe frame member 26b the moisture impervious sheet 28b is adhered to theupper surfaces of the container body 12b and frame member 26b in a tautcondition to maintain the frame member in its deformed condition shownin solid lines in FIGS. 7 and 8. If desired, a vacuum forming anddie-cutting process can be employed to form the container body 12b andperipheral frame member 26b of the packaging system 10b in the mannerdescribed earlier in this application.

The methods of forming the packaging system 10b permits formation of theclosure lid 24b in a closed position, and also permits the inclusion ofan inwardly extending latching tab 50b on the lid for underlying theperipheral flange 23b of the container body 12b to provide an effectiveseal for the packaging system 10b after the lid has been opened to breakthe connection between the moisture impervious sheet 28b and the uppersurface of the container body.

In a preferred embodiment of this invention, as is shown in phantom inFIG. 7, the front end of the peripheral frame member 26b is molded in anoutwardly radius configuration to permit said front end to assume asubstantially linear configuration after it has been deformed to forcethe latching tab 50b into underlying relationship with the peripheralflange 23b of the container body 12b.

The packaging system 10b is utilized by lifting upwardly on the frontend of the peripheral frame member 26b to manually defeat the connectionbetween the latching tab 50b and the downwardly facing surface of theperipheral flange section 23b. The closure lid 24b is then pivoted abouthinge 32b to peel the moisture impervious sheet 28b off of the uppersurface 18b of the container body 12 when the sheet is adhered to saidupper surface. The integral hinge 32b formed by the web connecting thecontainer body 12b and the peripheral frame member 26b retains theclosure lid 24b on the container body when the lid is in its openedposition. After the desired number of premoistened wipes 21 have beenremoved from the interior compartment, the packaging system is reclosedby pressing down on the front wall of the peripheral frame member untilthe latching tab 50b snaps into underlying relationship with theperipheral flange section 23b of the container body 12b.

The peripheral frame members and container bodies of the packagingsystems of this invention may be made from suitable plastic materialswhich are well known to those skilled in the molding art. For example,suitable materials include polypropylene, polyethylene, and in somecases polystyrene. When the hinge is provided intermediate front andrear ends of the peripheral frame member it may be suitable to form theperipheral frame member from a material, such as polystyrene, which mayfracture at the hinge line when the lid is initially opened. In such acase the flexible sheet forming the top of the lid will provide thenecessary hinge action, and also will retain the fractured sections ofthe frame member together. However, when a more reliable or durablehinge is required, polyethylene or polypropylene preferably is employedto form the hinge section.

The flexible moisture impervious sheet employed as the top wall of theclosure lids in all of the embodiments of this invention may becomprised of any suitable moisture-impervious material such as waxedpaper, plastic film, foil, or laminated combinations thereof. Themoisture impervious sheet is adhered to the frame member and the uppersurface of the container body by any suitable means, such as heatsealing, adhesive, etc. Although the preferred embodiments of thepackaging systems of this invention have been shown in substantiallyrectangular form, packaging systems in accordance with this inventionmay be formed in various other shapes and configurations.

What is claimed is:
 1. A moisture impervious packaging systemcomprising:A. a container body having a bottom wall and peripheral wallsextending upwardly from the bottom wall and terminating in an uppersurface which defines an access opening into an interior compartment ofthe body; and B. a closure lid hingedly connected to said container bodyand including a peripheral frame member and a flexible, moistureimpervious sheet, said peripheral frame member disposed exteriorly ofthe container body and circumscribing the access opening into theinterior compartment thereof for providing side margins of said closurelid, said moisture impervious sheet being disposed over the accessopening into the container body and being adhered to the upper surfaceof the container body to provide a moisture impervious seal over theaccess opening into said body, and being adhered to said frame member toprovide a top wall of the closure lid.
 2. The moisture imperviouspackaging system according to claim 1, wherein the frame member includesan upper surface disposed exteriorly of the upper surface of thecontainer body, and the upper surface of the frame and the upper surfaceof the container body are in substantially the same plane when theclosure lid is in a closed position.
 3. The moisture imperviouspackaging system according to claim 1, wherein said frame memberincludes transversely aligned, thinned zones in opposite sides thereofintermediate rear and front ends of said frame member for providing ahinge that divides the closure lid into a forward door portion which ismovable about said hinge between an opened and closed position, and arearward cover portion adhered to the container body when the doorportion is in either an opened or closed position.
 4. The moistureimpervious packaging system according to claim 3, wherein the uppersurface of the container body is an upper surface of an outwardlyextending peripheral flange section of the peripheral walls of saidcontainer body, the cover portion of the peripheral frame memberincluding inwardly directed retaining rib means disposed beneath, andclosely adjacent the peripheral flange section of said container forcooperating with the moisture impervious sheet to maintain the coverportion of the closure lid on the container body when the door portionis in either an opened or closed position.
 5. The moisture imperviouspackaging system according to claim 1, including a latching ribextending inwardly from a front end of the peripheral frame member, saidlatching rib being adapted to engage a downwardly facing surface of afront peripheral wall of the container body when the door portion of theclosure lid is in a closed position.
 6. The moisture imperviouspackaging system according to claim 1, wherein the container body andperipheral frame member are substantially rectangular in plan view. 7.The moisture impervious packaging system according to claim 1, whereinsaid closure lid is hingedly connected to said container body through aflexible section interconnecting a rear end of the peripheral framemember to a rear end of the container body.
 8. The moisture imperviouspackaging system according to claim 7, including a latching ribextending inwardly from a front end of the peripheral frame member, saidlatching rib being adapted to engage a downwardly facing surface of afront peripheral wall of the container body when the closure lid is in aclosed position.
 9. A moisture impervious packaging system comprising:A.a container body having a bottom wall and peripheral walls extendingupwardly from the bottom wall and terminating in an upper surfacedefines an access opening into an interior compartment of the body; B. atwo-piece closure lid including a thermoplastic, peripheral frame memberand a flexible, moisture impervious sheet, said peripheral frame memberbeing disposed exteriorly of the container body and circumscribing theaccess opening into the interior compartment thereof for providing sidemargins of said closure lid, said moisture impervious sheet beingdisposed over the access opening into the container body and beingadhered to the frame member for providing a top wall of the closure lid;and C. a hinge connecting the closure lid to the container body, saidhinge including a flexible, plastic web section forming a continuousmolded extension of a rear end of the peripheral frame member and a rearend of the container body.
 10. The moisture impervious packaging systemaccording to claim 9, wherein said moisture impervious sheet is alsoadhered to the upper surface of the container body to provide a moistureimpervious seal over the access into said body.
 11. The moistureimpervious packaging system according to claim 10, including a latchingrib extending inwardly from a front end of the peripheral frame member,said latching rib being adapted to engage a downwardly facing surface ofa front peripheral wall of the container body when the closure lid is ina closed position.